/*
 * Copyright 2019 ABSA Group Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package za.co.absa.spline.common.webmvc

import org.springframework.core.MethodParameter
import org.springframework.web.context.request.WebRequest
import za.co.absa.spline.common.future.EstimableFuture

trait EstimableFutureReturnValueHandlerSupport extends ScalaFutureMethodReturnValueHandler {
  protected val minEstimatedTimeout: Long
  protected val durationToleranceFactor: Double

  override type F = EstimableFuture[_]


  override def supportsReturnType(returnType: MethodParameter): Boolean =
    classOf[F].isAssignableFrom(returnType.getParameterType)

  override protected def getFutureTimeout(future: F, req: WebRequest): Option[Long] = super
    .getFutureTimeout(future, req)
    .orElse(Some(estimatedTimeout(future)))

  private def estimatedTimeout(future: EstimableFuture[_]) =
    math.max(minEstimatedTimeout, (future.estimatedDuration * durationToleranceFactor).toLong)
}